package com.tbit.uqbike.client.util.calibrate;

/**
 * 逆向坐标转换
 *
 * @author Leon
 * 2017-11-9 下午08:49:01
 */
public class GpsReverseCorrect {
    final static double pi = 3.14159265358979324;
    final static double a = 6378245.0;
    final static double ee = 0.00669342162296594323;
    private static final double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

    /**
     * 谷歌转原始
     *
     * @param wgLat
     * @param wgLon
     * @return
     */
    public static double[] googleToOri(double wgLat, double wgLon) {
        double[] latlng = new double[2];

        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
        double radLat = wgLat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        latlng[0] = wgLat - dLat;
        latlng[1] = wgLon - dLon;

        return latlng;
    }

    /**
     * 百度转谷歌
     *
     * @param gg_lat
     * @param gg_lon
     * @return
     */
    public static double[] baiduToGoogle(double gg_lat, double gg_lon) {
        double x = gg_lon, y = gg_lat;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
        double bd_lon = z * Math.cos(theta) - 0.0065;
        double bd_lat = z * Math.sin(theta) - 0.006;
        double[] tmp = new double[2];
        tmp[0] = bd_lat;
        tmp[1] = bd_lon;
        return tmp;
    }

    /**
     * 百度转原始
     *
     * @param lat
     * @param lon
     * @return
     */
    public static double[] baiduToOri(double lat, double lon) {
        /**百度转谷歌*/
        double[] bdlatlng = baiduToGoogle(lat, lon);
        /**谷歌坐标转原始坐标*/
        double[] latlng = googleToOri(bdlatlng[0], bdlatlng[1]);

        return latlng;
    }

    /**
     * 纬度转换
     *
     * @param x
     * @param y
     * @return
     */
    private static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    /**
     * 经度转换
     *
     * @param x
     * @param y
     * @return
     */
    private static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }

    public static void main(String[] args) {
        /**百度转原始*/
        double[] latlng = baiduToOri(36.6197750000, 101.8241170000);
        System.out.println(latlng[0]);
        System.out.println(latlng[1]);
    }
}
